银河系中心白矮星作为非弹性暗物质探测器
Milky Way White Dwarfs as Inelastic Dark Matter Detectors
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中文总结 AI 辅助
本研究提出银河系中心白矮星可作为非弹性暗物质探测器，通过外部湮灭产生伽马射线信号，并与H.E.S.S.观测比较，给出TeV尺度IDM散射截面限制及暗光子介导和higgsino模型参数约束。
中文摘要 AI 辅助
我们表明，银河系中心的的白矮星是探测非弹性暗物质（IDM）湮灭的灵敏探针。穿越白矮星的IDM粒子，如果其能量降至非弹性散射的运动学阈值以下，可能会被引力捕获而不会完全沉降在其内部。在这种状态下，一部分入射粒子保持在长寿命轨道上，这些轨道延伸至白矮星体积之外，使得湮灭部分地发生在天体外部。随后，一些湮灭产物逃逸，而不是被恒星物质吸收，从而产生可能可探测的信号。我们估算了由这些系统产生的外部湮灭的集体伽马射线通量，作为IDM参数的函数，并将其与H.E.S.S.在银河系中心一度范围内的观测结果进行比较。通过这一比较，我们在对该区域IDM密度做出大体保守假设的情况下，推导出TeV质量尺度上IDM散射截面的初步限制。作为一个具体应用，我们将这些结果映射到质量分裂在MeV尺度的暗光子介导模型和higgsino模型的具体参数约束中。
英文摘要
We show that white dwarfs in the Galactic Center are a sensitive probe of inelastic dark matter (IDM) annihilation. IDM particles traversing a white dwarf may become gravitationally captured without fully settling in its interior if their energy drops below the kinematic threshold for inelastic scattering. In this regime, a fraction of the incoming particles remains bound on long-lived orbits that extend beyond the white dwarf's volume, enabling annihilation to partially proceed outside of the object. Some of the annihilation products subsequently escape, rather than being absorbed by the stellar material, producing a potentially detectable signal. We estimate the collective gamma-ray flux from the external annihilation sourced by these systems, as a function of the IDM parameters, and compare it to H.E.S.S. observations within the central degree of the galaxy. From this comparison, we derive tentative limits on the IDM scattering cross-section at the TeV mass scale, under largely conservative assumptions for the IDM density in this region. As a concrete application, we map these results into specific parameter constraints for dark photon-mediated and higgsino models with mass splittings at the MeV scale.
发表机构
- SLAC National Accelerator Laboratory, Stanford（斯坦福直线加速器中心）
- University of Victoria（维多利亚大学）
- TRIUMF（崔姆夫）
机构由 AI 辅助整理，请以论文原文为准。
